Other notes:
The northbridge on this system gets crazy hot. Stock, it just has a heat sink but no fan, I put a fan on it and that helped. I originally tested the system using an in-house atx power supply everything ran fine... now with the M4... crash, crash, crash.

Also if the computers on and I unplug something in the usb or plug something new in... crash.

Any thoughts or similar experiences.

I'm going to leave everything in the car and hook up my in house atx and see if its stable. I'll get back to you guys.

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I searched some more and found someone with my exact issue. He put the comp. on swtich to jp1 and said it worked fine... I did that, I it did work perfectly fine. Then i put it back in the car... nothing. Jp1 when connected, now disables the m4 atx completely. The light next to j6 stops blinking altogether. J8 is still stuck on on all the time. When i disconnect the jp1 to get the light back on, its blinks constantly and fast [j8 still hot all the time]. When I connect to j8 ot turn the system on then then remove the wire to let it boot,.. the system turns on and stay on regardless of whether I remove the acc line [yes post 1 is down to to a 5sec start and 30 sec shut down]. This contraption doesn't seem to do anything more then once. Each jumper acts different every time I get it to turn on.

If you can try another motherboard, please do. The combination of the M4 and your current motherboard might not be a very amenable one.

Why would a power supply and my mother board not work well together. I've built 5 computers and the carputer is driving me nuts. When building a home pcm in terms of PS's, I find one that suits my power needs, I hook it up, and it simply works... Why would the m4 care about the board its supplying power to?

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Why would a power supply and my mother board not work well together. I've built 5 computers and the carputer is driving me nuts. When building a home pcm in terms of PS's, I find one that suits my power needs, I hook it up, and it simply works... Why would the m4 care about the board its supplying power to?

In your situation, unless you try another board with your M4, you won't be able to determine whether your M4 is faulty or not. Hence the reason for my suggestion. If the motherboard works fine with an AC power supply and not with the M4, then logically the M4 should be suspected as being the culprit. To confirm, try another board with the M4 and see what results you get.

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With a desktop PS things are fine. I'm not sure if M4's are just generally awful or whether its just this one, but being that my 30 days are up... I don't think I'll be getting another M4. Maybe a DSatx with a 20 to 24 converter.